these 4 derivations will be built:
  /nix/store/76klp35n8afbsjv135655i8f6p0cfwrb-crate-rand-0.10.3.tar.gz.drv
  /nix/store/88sh4chabj44hd1pg73dkrn3va1ls50c-rand-0.10.3.drv
  /nix/store/jccczz439iffjha01sh7k73kxngdz3wz-cargo-vendor-dir.drv
  /nix/store/90wgka4c0k9rcz76cfx4c3l7z047kyd0-fast-nix-gc-proptest-0.1.0.drv
Failed to find a machine for remote build!
derivation: 88sh4chabj44hd1pg73dkrn3va1ls50c-rand-0.10.3.drv
required (system, features): (aarch64-linux, [])
1 available machines:
(systems, maxjobs, supportedFeatures, mandatoryFeatures)
([aarch64-darwin, x86_64-darwin], 8, [big-parallel, recursive-nix], [])
Failed to find a machine for remote build!
derivation: jccczz439iffjha01sh7k73kxngdz3wz-cargo-vendor-dir.drv
required (system, features): (aarch64-linux, [])
1 available machines:
(systems, maxjobs, supportedFeatures, mandatoryFeatures)
([aarch64-darwin, x86_64-darwin], 8, [big-parallel, recursive-nix], [])
Failed to find a machine for remote build!
derivation: 90wgka4c0k9rcz76cfx4c3l7z047kyd0-fast-nix-gc-proptest-0.1.0.drv
required (system, features): (aarch64-linux, [])
1 available machines:
(systems, maxjobs, supportedFeatures, mandatoryFeatures)
([aarch64-darwin, x86_64-darwin], 8, [big-parallel, recursive-nix], [])